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No. 615,7". Patented Dec. l3, I898. J. JARDINE.

TUBULAR BOILER.

(Application filed May 10, 1897-) (No Model.) 2 Sheets-Sheet I.

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No. 6l5,7|l. Patented Dee. I3, I898. J. JARDINE.

TUBULAR BOILER.

(Application filed May 10, 1897.) (No Model.)

2' Sheets-Sheet 2.

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UNITED STATES PATENT Oinucn.

J OIIN JARDINE, OF MOTHERlVELL, ENGLAND.

TUBULAR BOILER.

SPECIFICATION forming part of Letters Patent No. 615,711, dated December13, 1898.

Application filed May 10, 1897. $erial No. 635,956. (No model.)

steam-and-water drum overhead and the muddrums below with theconnecting-tubes in such a manner as to permit of easy examination andconvenient cleaning or repairs and so as to occupy a minimum of space,while providing efficient circulation. and a maximum generation ofsteam.

In the accompanying sheets of explanatory drawings, Figure 1 is alongitudinal sectional elevation, and Fig. 2 is a sectional endelevation, showing one form of my improved boiler suit-able for landpurposes. Figs. 3 and 4 are similar sectional views of another type ofmyimproved form of construction suitable especially for marine purposes.

In carrying my invention into effect I arrange a boiler when intendedfor land purposes, as shown in Figs. 1 and 2, with a longitudinalsteam-and-water drum A, placed at the upper end of the boiler B B andhaving beneath it two cross or transverse waterdrums or water-and-muddrums O 0, connected therewith by circulating small-diameter tubes D D,the furnace E being arranged, preferably, at the front end of the spaceE, beneath the upper steam-and-water drum A, and being provided with afirebridge e and inner flue-walls e for directing the flame and heatedgases between the tubes, so that they may pass in a circuitous mannerfrom the furnace to the flue, uptake, or outlet F.

I arrange my upper steam-and-water drum A preferably with a baffie-plateor dividing screen or screens G near the inner end, so that when thefeed-water, which I introduce into that end through the ordinaryperforated supply-pipe connection H, is admitted thereto it flowsdownward through the vertical connecting tubes D to the transversemud-drum O, lying underneath the longitudinal steam-and-Water drum. Iprovide uptake-tubes D from this mud-drum, so that the water may passagain or return to the upper main drum and that it may then flow throughother downtake-tubes D, another dividing-screen G being'provided tofacilitate positive circulation, as illustrated, the water therebypassing into the first waterdrum 0, lying at the rear end of thefurnacebars, and from this water-drum C, I also provide anuptake-battery of tubes D, connected to the main steam-and-water drum Aabove. Thus my main upper drum A is connected to the lower drums O O byfour ranges of tubes D D D D',which serve to keep the water in completeand efficient circulation.

I may preferably'arrange my steam-andwater drum, as also the mud-drum,with flat instead of circular surfaces or tube-plates to receive thetubes, the steam-and-water drum having such flat surfaces or tube-platesupon the under side, while the mud-drum is provided with such upon theupper side, the shape thereof being otherwise circular. I may alsoprovide a baffle or division plate upon the transverse mud-drum toseparate mud from the upgoing water.

I sometimes provide a perforated divisionplate K in the upper drum A forassisting the flow of the currents of water therein and for insuringdry-steam collection.

By'this arrangement of construction I am enabled to employ dirty orimpure water and to trap the water and isolate the impurities, so as toconfine all the mud and other precipitated matter in and near the rearmuddrum 0, which mud-drum is in position convenient of access and can bereadily cleaned and scaled, and its tubes can be readily ex amined orreplaced.

I attach ordinary mountings to the upper main drum and fittings fortaking all the steam to suit any desired requirement.

I provide air-spaces b 1) between the mainflue walls B B andbaffle-plates B to assist the heat-currents and to increase combustion.

I also regulate the supply of air to the airspaces by means of a baffleor other door placed in any convenient position.

\Vhen arranging my improved type of boiler for marine purposes, as shownin Figs. 3 and 4, I employ a horizontal upper steam-andwater drum A, asbefore described for my land-type boiler, and I arrange three lowerdrums C C O in connection with this, having small circulating-tubes D D.passing from one to the other. The upper main drum A, I utilize as thesteam-'and-water drum and take the feed-water therein into thebafflechamber II at one end of the same, and I connect this upper drum,by means of a battery of small tubes D, to two longitudinal lower drumsC 0 disposed one on each side of the furnace-space E. Ialso connect atransverse drum G which forms the end bar or bridge at the back of thefurnace, to the upper drum by means of up and down take batteries oftubes D, so that the main upper drum is in connection with the threelower drums O C O, and although I find it convenient to connect thethree lower drums together by branches L L they need not necessarily bein connection one with the other. This is a form of boiler I may employfor water less dirty than would be used with the boiler shown in Figs. 1and 2 and is also particularly useful for rapid steam-generation and forhigh pressures.

I provide divisioneplates K, as hereinbefore described, as antiprimers,and these insure dry steam, and I arrange any suitable mountings andfittings upon the various drums to suit any particular requirement.

In reference to the modification illustrated in Figs. 3 and at, the flueor uptake to funnel may be arranged according to circumstances.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

In combination, the upper drum extending from front to rear of thefurnace, the transverse drum 0 behind the fire-box, the tubes connectingthe same with the upper drum, the independent drums C C extending acrossthe ends of the transverse drum and longitudinally of the furnace thetubes D connecting the upper drum with the side drums C C and theconnections between the side drums and the transverse drum,substantially as described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

JOHN JARDINE. lVitnesses:

ARCI-IIBALD JEFFREY, JAMES GoUoH.

